Add a new flag terse to show only the results and summary

[ccojocar]

The new flag '-terse' will only show the results and summary ignoring any logs occurred during a scan.

fixes #985

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (36f6933) 72.08% compared to head (c4c087c) 72.08%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #986   +/-   ##
=======================================
  Coverage   72.08%   72.08%           
=======================================
  Files          51       51           
  Lines        3586     3586           
=======================================
  Hits         2585     2585           
  Misses        911      911           
  Partials       90       90           

Impacted Files	Coverage Δ
cmd/gosec/main.go	0.00% <0.00%> (ø)

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